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helpers: implement getPPIDof on BSDs (#972)
Get PPID from `struct kinfo_proc` via sysctl for the specified PID. Adjusted for minor differences between each BSD kernel.
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1 changed files with 45 additions and 0 deletions
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@ -5,6 +5,31 @@
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#include <sys/utsname.h>
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#include <iomanip>
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#if defined(__DragonFly__) || defined(__FreeBSD__) || \
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defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
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# include <sys/sysctl.h>
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# if defined(__DragonFly__)
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# include <sys/kinfo.h> // struct kinfo_proc
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# elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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# include <sys/user.h> // struct kinfo_proc
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# endif
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# if defined(__NetBSD__)
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# undef KERN_PROC
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# define KERN_PROC KERN_PROC2
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# define KINFO_PROC struct kinfo_proc2
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# else
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# define KINFO_PROC struct kinfo_proc
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# endif
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# if defined(__DragonFly__)
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# define KP_PPID(kp) kp.kp_ppid
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# elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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# define KP_PPID(kp) kp.ki_ppid
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# else
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# define KP_PPID(kp) kp.p_ppid
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# endif
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#endif
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static const float transforms[][9] = {{
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1.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f,
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@ -369,6 +394,25 @@ void matrixProjection(float mat[9], int w, int h, wl_output_transform tr) {
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}
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int64_t getPPIDof(int64_t pid) {
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#if defined(KERN_PROC_PID)
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int mib[] = {
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CTL_KERN,
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KERN_PROC,
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KERN_PROC_PID,
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(int)pid,
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# if defined(__NetBSD__) || defined(__OpenBSD__)
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sizeof(KINFO_PROC),
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1,
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# endif
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};
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u_int miblen = sizeof(mib) / sizeof(mib[0]);
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KINFO_PROC kp;
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size_t sz = sizeof(KINFO_PROC);
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if (sysctl(mib, miblen, &kp, &sz, NULL, 0) != -1)
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return KP_PPID(kp);
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return 0;
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#else
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std::string dir = "/proc/" + std::to_string(pid) + "/status";
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FILE* infile;
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@ -401,4 +445,5 @@ int64_t getPPIDof(int64_t pid) {
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} catch (std::exception& e) {
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return 0;
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}
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#endif
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}
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